LOCAL HEAT MASS-TRANSFER DISTRIBUTION IN A SQUARE CHANNEL WITH FULL AND V-SHAPED RIBS

Naphthalene sublimation experiments have been conducted to study the t urbulent heat/mass transfer characteristics of airflow in a square cha nnel, in which two opposite walls are roughened with aligned arrays of full ribs and V-shaped ribs. The detailed distributions of the local heat/mass transfer coefficient on the ribbed walls and on the smooth w alls are obtained. Results show that there are significant spanwise as well as streamwise variations of the local heat/mass transfer coeffic ient on the exposed surfaces of the ribbed walls in the oblique full r ib and V-shaped rib cases.